The theater shooting in Colorado last week continues to generate discussions about firearms in America, but it is doing more than just getting people to talk. Gun sales in Colorado have skyrocketed in the days since the Aurora, CO massacre.

James Holmes, 24, is being held in connection with the Friday morning outburst that left 12 people dead and injured dozens more. Authorities allege that Holmes opened fire shortly after the midnight screening of Batman: The Dark Knight Rises began at the Century Aurora 16 theater. Only hours later, though, locals were lining up in droves to equip themselves with the same kinds of weaponry.

Jake Meyers tells the Denver Post that he arrived for work at Rocky Mountain Guns and Ammo on early Friday to find a line of 15 to 20 people waiting outside of the store. Three days later, he said surging gun sales yielded “probably the busiest Monday all year” and that, for the first time all year, firearms classes taught by the store’s staff were booked for three weeks straight.

“It’s been insane,” Meyers says.

“A lot of it is people saying, ‘I didn’t think I needed a gun, but now I do,’ ” Meyers adds. “When it happens in your backyard, people start reassessing — ‘Hey, I go to the movies.'”